Tubular boiler



(No Model.) 2 Sheets-Sheet l.

B. MGGERREN. TUBULAR BOILBB..

No. 389,893. Patented Sept. 25, 1888.

32' il ii r v i y l Hlhwlll Suva/wko@ (No Model.) 2 Sheets-Sheet '2.

B. MGGERREN.-

TUBULAR BOILER.

VN0. 389,893. I Patented Sept. 25, 1888.

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TUBULAR soiree.

SPECIFICATION forming part of Letters Patent No. 389,893, datedSeptember 25, 1888.

` Application nien March si, rasa. serial Nd. sott-te. (No model.)

.To all whom it may concern.-

Be it known that I, BERNEBD McGERREN, of Rockford, in the county ofNVinnebago and State of Illinois, have invented cert-ain new and usefulImprovements in Tubular Boilers; and I do hereby declare the followingto bea full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to an improvement in steam-boilers, the object ofthe same being to provide an improved tubular boiler in which the amountof space and material may bc economized, and at the same time the amountof i5 exposed heating-surface will be greater than in the presentboilers of this class.

A further object is to provide a boiler of this character which willembody essential features in the construction thereof, whereby zo thesame will be rendered especially strong and safe.

A further object is to so construct the boilers relative to each otherthat the tubes in the lower battery may be removed when occasionrequires and placed in the upper boiler without damage to lthe tubes.

A further object is to provide a boiler embodying the above featureswhich shall be simple and economical in construction and 3o durable andefficient in use.

Vith these ends in view, my invention consists in the certain featuresof construction and combinations of parts, as will be hereinafter fullydescribed, and pointed outin the Claim.

In the accompanying drawings, Figure 1 is a longitudinal sectional viewof the boiler. Fig. 2 is a front end view thereof, and Fig. 3 is acrosssection.

joining the boilers, and in which the same are suspended by means of thearms 2, riveted to the boilers 3 and 4. The walls converge, as shown,about the pipes 7, and are provided with the man-holes 23. The boilersare formed in the are of a circle and are eut away--the lower boiler, 3,at the upper curve and the upper boiler, 4, at the lower curve. To theboilers at the cutaway portions are secured in 5o any suitable mannerthe heavy metallic plates 5, provided with a series of holes, 6, toreceive the upright connectingpipes 7, between thc The figure lrepresents the side walls ad-v two boilers. It will be observed that byproviding the plates 5 the boilers are strengthened, in that theresistance is lessened in the proportion of space occupied by the pipes7.

The boilers are provided withl a series of longitudinal tubes of anypreferred number, the same being secured in the end shells thereof. Thefront frame-work, 8, is of ordinary construction, and is located at asuitable distance from the boiler to form the iiue 9 for the conductofthe products of combustion. The rear frame-work, 10, is composed ofbrick or similar material, and is provided with the manholes 1l, havingthe set doors 12, the manholes being so located as to render access tothe flues 13 perfectly convenient for the purpose of cleaning the same.

The furnace 14 is beneath the front part of the boiler, and is out offfrom the fines by means of the bridge-wall 145-. The fire starting atthis point, the products of combustion will be drawn along the flue 13and through the tubes l5, being deflected therein by the deflcctor 16.From the tubes 15 the products of combustion will continuetheirpassageintoiiue 9, and thence through the passage 17, around the pipes 7, atwhich point, owing to the exposure of said pipes 7 and to thecontraction of space due to the convergence of the walls 1 at thispoint, the heat is more intense than at the point immediately above theiire. The products of combustion passing through said passage aredeiiected from flue 13 into tubes 19 by means of the deiiector 18, andthence pass up through the smoke-stack 20 into the open air. f

The upper boiler, 4, is provided with the steam dome 21, of ordinaryconstruction.

The boilers are provided with the man-holes 22, by means of which accessis gained and the cleaning thereofrendered convenient. In constructionthe upper boiler is slightly shorter than the lower one, the object ot'which is to enable the tubes in said lower boiler, when removed from anycause, to be shortened and utilized in the upper boiler, thus effectinga great saving.

A boiler of this construction possesses superior strength, and, havingfour returns in a contracted space, will afford a great saving in fuelrequired to run the same.

Having fully described my invention, what I IOO claim :is new, :mddesire to secure by Letters and 13, for the passage of the products ofcomlatenb, is busbion, substantial ly :is shown and described. In atubular boiler, the Combination, with In testimony whereof l have Signedthis :L lower boiler having a flat upper surface, a Specification in thepresence of two subserilr 5 shorter boiler having n. flat lower surfaceloing witnesses.

cated directly over the lower boiler, a, series TFINFVD MoU il-PVN oftubes passmg through said boilers, and a u J L U l j series of uprightpipes secured in the flntisur- VitneSSes:

faces and connecting the boilers, of side walls \V. 1I. Ruivlv,

xo oomferging opposite said pipes, and fines 9 NEWTON CRAWFORD.

